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I agree with ggiaquin answer, but I'd advise against giving the character some overly nasty habits if it isn't necessary just to make them more unsymphatetic, as other users have suggested. Adding...
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#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/28996 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/28996 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
I agree with ggiaquin answer, but I'd advise against giving the character some overly nasty habits if it isn't necessary just to make them more unsymphatetic, as other users have suggested. Adding uncanny traits just for the sake of doing so will create an overly parodistic villain. There are a lot of movies where this happen: somehow, the big boss of the world-menacing, all-powered evil organization is a _whiny weak man with daddy issues._ It's not very believable and it doesn't really work. _Evilness_ comes with a measure of coolness, just to be sure. But almost everyone will have a "point of no return", meaning, an action so evil that will go against that person moral standard. Of course it changes from person to person. What you _can_ do is to describe how and why that villain is evil, and show how little regard of human life/ethics/pain/well-being/etc he has. Disgust from the character shouldn't be disgust for his habits (e.g., wetting the bed) but from the moral value of his actions (e.g. eating newborns out of fun).